chore: release v0.12.0 #2829

Job	Run time
rustfmt	10s
cargo-deny check	20s
codegen	21s
Interop Tests (ubuntu-latest)	38s
check (ubuntu-latest)	2m 5s
Interop Tests (macOS-latest)	1m 5s
Check MSRV	44s
check (macOS-latest)	2m 51s
test (ubuntu-latest)	3m 1s
Interop Tests (windows-latest)	4m 23s
check (windows-latest)	4m 20s
test (macOS-latest)	2m 47s
test (windows-latest)	5m 15s
Check unused dependencies (ubuntu-latest)	4m 15s
Check unused dependencies (macOS-latest)	5m 13s
Check unused dependencies (windows-latest)	6m 47s
	44m 15s

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